Improvement in machines foe forming sheet-metal



To all whom it may concern:

"iiitli gisten WILLIAMA. TARBUTTON, 0F, `nARRISBURG,v PENNSYLVANIA.

Letters Patent No. 94,851, dated'Sqite/mber 14, 1869,

4 wcm MPROVEMENT IN' MACHINES FOR FORMING- SHEET-METAL. PANS.

Th Schedule referred to in these Letteral Patent and making part of the same. y

, Be it known that I, WILLIAMKA. TARBUTTON, of the city of' Harrisburg, i-n the county of Dauphin, and

State of Pennsylvania?, have invented a new and .im-

Figure 6 is a view representing the corner-lap oi` pan as formed by this machine.

y Figure 7 is a view representingthe corner-lap of pan as formed by the machineV S. H. Kennedy patented, Novexnber, 1868.

Like letters in the figures-of the drawingsy indicate like parts. Y 4

My invention has for its objectthe bending or forming of the sides and, ends'of sheet-metal pans; and

First, in providing the bed andbendingfplates'of the machine with elongated slots, in combination with corner-formers i and clamp pivot-blocks, so that by meansl of the said slots, the cornerfformers and clamppivot-blocks may be adjusted therein, to suit any size of clamp or pan required, without removing either from the plates.

Second, in having the heads of the corneretormers7 so inclined as to, conform lto inclined blocks adjustable in elongated slots of the bending-plate, when thelatter is thrown up, so -that the corner-laps may be ,formed in such a manner as to'admitof their being' folded down with greater facility in the finishing of the PML4 1 construct my machine as follows:

A is the bed-plate.

B, the hendingplate, which' is united to the former ina proper manner by pivotescrews.

0,' the clamp, attached to the pivot-blocks a a-by.

screws, orothcrwise.

.D D, the corner-farmers. v

E, thelever, attached, by a pivot-screw, to a block in the centre, ne`xt to the edge of the bendingplate.

F, the gauge for giving the required .depth to the sides andends of the pan, and adjustable by means of screws and slots. y L The corner-formers D D and clamp pivot-blocks a a have tongues' or projections fitting suiiiciently loose/inV elongated slots b b b b as to vadmit of their being moved freely therein.

'lhe foi-mers, each, arefasten'ed to the bed-plate by a screw or bolt passing through the tongue, and having ascrew-nut on the end, iitting in a recess ruiming the length of the slot underneath'of the plate, to hold the ,screw-nut, when turning-the screw orbolt;

The pivot-blocks are fastened byset-screws underneath of the bending-plate, the -shoulders formed by the tongues fitting in recesses,c o, above, running the length of the slots.

Thus, by loosening and tightening the screws, both the former-s and piv0t-blocks may be readily adjusted to suit anysize of clamp required'.

Operai/ion.

My machine, in use, will be provided with six clamps, of different sizes, for as many sizes of pans. When a clamp of one size has been used, and it is desired to use another of a larger or smaller size, the screws connecting the clamp with the pivot-blocks are detached therefrom, andthe one' selected put in its place, by loosening the set-screws fastening they pivotblocks to the plate, and slipping them along in the slots until they connect prop erly with the clamp,

when the screws are inserted, and the set-screws tight-- ened. Thus, itwill be seen, if a necessity or demand should occur, at any time, for a pan of a new size, and either of the sizes of clamps accompanying machine will not answer for the purpose, it can be easilymet by sim-plygetting a new clamp.

In forming the paus, the sheet-metal having been suitably prepared, and the gauge set to give the required depth to the sides 'and ends of the pan, one end ofthe sheet-metal is then placed under the clamp, with its edge against the gauge, and the lever brought around over the clamp, the latter havinga slight swe1l ing surface on the top thereof', to admit of' the lever binding the clamp firmly to the metal. The bed-plate being fastened to the bench by screws or bolts, the

bendingplate is. then thrown up, forming the end ,of

the pan, as seen 'in tig. A2. rlhe metal is then withdrawn from under the clamp, and the other end-and sides submitted to a like operation.

In forming the sides, the corner-fermiers are moved upagainst the ends, and fastened. At this stage 0i' the operation, it will be observed, by simply having the heads of the cornerformers inclined to conform to Vthe angle of the plane .of the bending-plate when thrown up, the corner-laps will be formed at right Aangles\(see m, iig. 6,) beingA peifectlycompresscdor broken from the bend or turn of the meta-l to the exl treme end or edge thereof, so that but one or two taps of the malletare required Yto fold the lap down, while inthe machine of S. H. Kennedy, the cornerrform ers being inclined to conform to inclined channels in the bending-plate, the corner-laps7 willbe formed at an acute angle, (see n, fig. 7,) being perfectly compressed at the extreme end only; consequently careful handling and several blows of a s harp-cornered mallet are required to make them turn or break where they should in folding them down, and, "moreover, such a machine cannot be made adaptable to forming apau of any size that may be required, as the size of lthe pan must be governed by the number and position of the inclined channels in the bending-plate, each channel having an extra clamp pivot-block, to suit the several sizes of clamps used; and then, when itis desired to make a pan of a shallow depth, it cannot be done without the gauge coming in contact with corner-former when bending-plate is thrown up. All these disadvantages are obviated by this machine, by dispensing with the inclined channels, extra corner-former, and"clamp pivot-blocks, and an extra pivot-block for level', and the changing ofthe latter thereto, and simply/'making both the corner-formels and L"clamp pivot-blocks77 adjustable in elongated slots, to'suit any size of panior clamp required, as described,

thus effecting a considerable saving of time andwlabor in the forming and finishing of pans of various sizes, and,-besides, rendering the machine more simple, and

-a good deal less expensive in cost of construction.

I contemplate using another kind of corner-form er, D', and angular blocks d,- adjustable in elongated slots in the bending-plate, by means of a bolt cast therewith, and fitting through the slots, and having a screw-nut on the end, for fastening them to the plate, the col'ner-in'niers being inclined from the side, instead of from the top, as in those herein described, to

conform to the angle of the blocks, so as to give the corner-laps of the pan a quarter turn or bend from arigh't angle, and thus, with one blow of the mallet, fold the lap down. This turn or bend must be made by a slight tap of the mallet, before iinal blow is struck, when the laps are formed at right angles, as herein referred to. Hence it is'proposed, by this kind of a former and the angular blocks, to save the time required to do this by hand with a mallet, and give the turn or bend with the machine. It is true this is a small item where a fewpans are made, but, in large establishments, say, where a thousand pans are made at a time, it would require four thousand blows or taps ofthe mallet to make this turn or bend, consuming a great deal of time, which could bc done by the machine in theoperation of forming the pan. So, considered in this respect, it may be found desirable to provide the machine with angular blocks and cor- W. A. .TARBUTTONJ Witnesses: r

D. C. KoLP, C. W. KLINEDINST.

ner-formers to correspond, in case they should be i 

